regex101: PCRE (Legacy) Match Workspace

Non-Capturing Group(?:\s+|^)

1st Alternative\s+

\s+any whitespace character, repeated at least once

2nd Alternative^

^start of string

\S*any non-whitespace character, repeated any number of times

Negative Lookbehind(?<!\w)

\wany word character

Non-Capturing Group(?:https?|<filter>)

1st Alternativehttps?

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

2nd Alternative<filter>

<filter>the literal text <filter> (case sensitive)

Negative Lookahead(?!\w)

\wany word character

\S*any non-whitespace character, repeated any number of times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

25 tokens

Regular Expression

(?:\s+|^)\S*(?<!\w)(?:https?|<filter>)(?!\w)\S*

New

 hello, my name is James. 
John    30  hello, my name is John. Here is my favourite website https://stackoverflow.com
Jim 27  Hi! I'm another persoon whose name begins with a J! Here is something that should be filtered out: <filter>
Do not filter anything when <filter or word<filter>word is present

Substitution

 hello, my name is James. 
John    30  hello, my name is John. Here is my favourite website https://stackoverflow.com
Jim 27  Hi! I'm another persoon whose name begins with a J! Here is something that should be filtered out: <filter>
Do not filter anything when <filter or word<filter>word is present